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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aac2bb60a0d0d9a272a5e00a15955bc20f1f7fc6bc3589df9b1661c46e7a07f' 
  AND token = 'gbKIb1vtZ6R96kx6JsVWwA4jbvgOqiuiOoMYLRLzE64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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