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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd5cd0ff844c581c399fc3c6829e17a358bcbcbfc4a22857e0fd5513718c4e7' 
  AND token = '7mO1w4dVVD52cRmyTRuv+fJCoAKWtwLg6Z24aybS1wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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