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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef623df1f34a3d2d9d328c76dbe83d2e5c9c44af2c9bff035935d69d1c99b6a' 
  AND token = 'MZViY0dfDY/pykiS3qw/rKO45azJE5nzIEPfdR5u+ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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