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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bccd2c169ae13058bae489e1cbea97811f39348ad4793383c9127b689bc674f' 
  AND token = '68UCrgwm3xBibVaUjmfYvzf06UFeSgoqgOg0mYAh3TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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