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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc6cea523785d596a9460081deb81c674adfbdf0cdd39fb7828c5f55dd4f4b7' 
  AND token = 'DYuH9r2pvgdd2HkKeBs8OjZCb8yDBsKlPPAzQuc+Ljk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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