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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a08d03393fbb486174c7eb433ea68162feda7ebefff52ce9245419b29211ea5' 
  AND token = 'qItZ82x57kAwQdaN9sfnxlIZuQVyAUoLicfgIB8iZ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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