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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ad17376027f1b9bc789253187e34bbac67927c5a90e998357816b166fe3103' 
  AND token = 'tX9MYWR7luEYazw9eZd7tJb8TYWsX7S43KlovRuWo9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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