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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc331edd59d04f580eee651e5b2d8c3b2f4198ceb8e01becddd469a6f70c1cf8' 
  AND token = 'VFtGKq7zGq/t5gremUdLaSpgUkSAzSz2fZGqakX6aNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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