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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bded4edec44f7e17925e63a19be86ae4afd1be0f948f35b1841bfd096037a85' 
  AND token = 'YM9FbRqMLUcL/3xnHs0W0ErXw2JK2sjzMilkm5rFK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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