SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41575b8b3131a015ac4206679623a247fa2f5ce284c98b670e79df5a7cce921' 
  AND token = 'aom/AzeHB8wf3/qtnG2LBNZuEHM3XudFrwpG/0dVjWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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