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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92649496bc76d06438d84afc37e4645cb8450091eb4af6052c2b16a146f96484' 
  AND token = 'Mua2tAt5yWJrR7HMF0eWpxKZ35KhQQI+Ap3LJBEvZHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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