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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4005a3349e975800592fc545cd382c166cca4af23d840b7fde892221ddde8e' 
  AND token = '2G6yUbY9fjz+SE/jbJEPbekcHFytvLejW0N/f7VtFHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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