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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d38c94bae9423400ea4bed0631f250f9d42efa95d78ff0934d2c7a8dda1f8ca' 
  AND token = 'g578eRBsVjDtlY/PW4vXEgRIG8pM3jA7+gHy01/i4kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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