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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dabecfe5c36599c602048bddd586a75a1d9161c47d58ebcc8ad303465a82d8' 
  AND token = 'DbT72MAwxfihx3mEEleVeYdbINny3oxRT3JvxonHdRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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