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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e002304420aa2b02cf346773442209b5313f338aeaf928a7a6525efbe0277d37' 
  AND token = 'mHe65vwC9XSM0JJU5sw9q0GzKIwmEHUKqhUPODIB8OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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