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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9816b63ae1a076599a2afda250c7f4cf22efdee643ace7ff4d03a9f3d2bceb' 
  AND token = 'UoN7yYViEmRV35xwPkMQZQHa0jM+6Qj78Op88EVZkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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