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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd973b23437d801f4624202e73efef86ebd856026347ba3b974b62db02e361edc' 
  AND token = 'o81bbzfkdE2w0R2CbG3DmezHEEj9yT2++g/Rdc7OL1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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