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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267f017bfb3fa23ae9551ddef4b002148eab8b6cb4c99730ebc639262a8ecfe8' 
  AND token = 'dtBS9EtKnz34KeBdTGSWZMrbXiDrWGqrXzBPEcxb74A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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