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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af85b1dc6f3cec3b52613ad3981a9cb47d5b429ea54b3100b3fea4cab119ef34' 
  AND token = 'gv0yqo2yNADUFMeXCEHX95Y9VM+JFS4VKDYNm6K6PAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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