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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521d232dc4b1379ca99e59ed0b969e85b415f1fc21e89a6c9b0c939a83efab1b' 
  AND token = 'kkWZXCks1rJFwX50/QqtjtXjfOWNJgCWkSNmiuldl6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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