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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b5313f4de098dbdf4c54217018305e0691d69937139e7968d89d1def5fce8c' 
  AND token = 'z5/corJLgsmuLnX7xXhB8leD+CtRUyxu07kfYAsFKSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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