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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bced359ba42c659f8b18f9a963c49728ee16bc00faf6b84b0d927c8b26b4144c' 
  AND token = 'UommRsJSJLdQ9MacHsflRZ8yFMW0rl5nfY3m9EdHI5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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