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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f6ab5a1afc45ea42890471d470672393828907e34132bbdb2ca2cf78e85ef6' 
  AND token = 'QWpaPzWLmSJ9uCo6kFExMoqIFlsDHHFGKQT40URrPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}