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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced24598212d76d0e424dc49cd4f0ff2f74cd08424c35f7ae1069b2ed6ae223f' 
  AND token = 'ZsOR1E8tdxVo9fHTD8+T9cTKhy8DE60Bv3LgxzMPDkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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