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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6733a486b0c28b45a210fd7f1c878e3566ac15f5b9aa4f636cbe0441d829f0' 
  AND token = 'LhTfHEBK7aiOUnBisKj43cY90kgLsiZqGTh2KL00RXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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