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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dbd2503c8e93b942dcd9db9ae0deb6df14f1578e013a3bea7affb1a405a819' 
  AND token = 'jLMPOavEGI9Cq3F/5328ghOy9Htj8HJMcrclnrj3oD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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