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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2595cd92197b3fcd322a101f7912353044f351c0d077a090b180a33d1d7b3ca8' 
  AND token = '4o1eegS9QZb5pCRcJ1FXlWXmtzXtH8VkOVtYUmLyDa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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