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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4bde6894d5d22d3eae2f312e3104a3aa9e700b901732b4302b077745f1ad08' 
  AND token = 'nWFQDGzOICKz5koVNY7GtG9pD0gM4601vSXwzoOMszU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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