SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483e2b083260a31e99c5501f060f557171ca3628318ce338b3f73cb6b0e71fc5' 
  AND token = 'BqDxeTV2dDrrd9HXVwvnYTZShzBk2ZRgoJRBOIVCLPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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