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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f54f4ca5ad68df5740122d31afe730c05ede41db4faf01e8ce6813fa552304e' 
  AND token = 'q5JclcoZi83Lcuz6FV2IE6QNXmiJtptFNCf3GSZ5FnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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