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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfad21598e8a5d24980702be2e0593d76b2ffd918f699e6ab0ba9a7fc7ae16c9' 
  AND token = 'aWEUacd+AvPo9yzWYT6Jr0Z0KlLM+YD5TVo7h/49NIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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