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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fab6e125b9efc8477df5f0e4b78f6ace8291fe895c796f0a3d6d80df024d17' 
  AND token = '2F1uZmrE19Q4vmayCc7aBVTqKw1h2ZPc4knWQj4sPwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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