SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444f2099690c37168d27370ed27b2ab708b41fdb4294ec83ce5ca3619c8d3c92' 
  AND token = 'SFLyi8vlKfCRtaqkIIw3BY1aZF3UxJ9zTJh3DUFXp18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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