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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab66b69c2902336663c28f7d5a9abb6c51b478c42563cb138746ec37c301a63' 
  AND token = 'Qwn6ggsGz5ZfjxTA1zEyffGO++Z9t1/tWyuG1WZHMLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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