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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ddd69a49dafa30858de91c767e6d55dfd6f8d19b83d7689ce8ea3baa3db639' 
  AND token = '/SgX7ilZ2U7esOPBsTpENZY5goOijU2qjR0/oT7BIlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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