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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dddd1698768d877f3421e70d1e57b728bd2461725ef6b65f85a4a9484204c62b' 
  AND token = '5Z6Eia7D7dhozW6uC0vC8HFuz8rEj9+gzHSDrvMUrpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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