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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df74f9c22b3e910234c0e5f00dd0ed5d0f771305999f461ec4dded581a0bd6b7' 
  AND token = 'yHHpvhKAlad+fU3U/LgPRm6hWMZElZYl0qbAPNL0QFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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