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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a0062f76bfa6090cb99793744889dd9be3c5e30c8997f8ca7429171ad3f93c' 
  AND token = 'DAfwN0031B5l9vhgafHmdr8sslQ8db+bkOb52zXsLzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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