SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95db280b97d71cb559c9f2b0546f4293385984166d6c179deec3fe0b5bf064b0' 
  AND token = 'xCCg59APqJsX0Cj8YZQTnIdUVOZtg/KwW/h9BAV7ppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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