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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0242120102531ad86c30cb1cb578ba699ce4877dbfab56db95ff3f98ede6c283' 
  AND token = '2xahPggARmrxrptRl2HSq81tn9ZX+jIU790osiUz7fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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