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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a294103ee3e53add35acf4b1b600a6390a27cfda3412f2e1a6ae6b085218372b' 
  AND token = 'wNc6U88dJP7SQw6FlJAAhKlawQs4vsbuJ4atRX+ErMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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