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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7103db4db59c7f23eca4d23b2f8c638a68a2f08218289fc9c120e6d527e92f' 
  AND token = 'p+sZxg7UDYGoWWJwynSV6JRfFJ7Tvw1dAJel8L8p7lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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