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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b57adddd72398e958c6fafd9041ed17a3d80700b29076e5e38ea635be288c6' 
  AND token = 'P17XAsUTxvBgo+N2joaiC8nC05kRclIHCd2ZDokSVGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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