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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f997676687d12a1e855ca3a6c7f24ded224e571bb035b4341b3d5188b6edbaf' 
  AND token = 'InQ2MmNLibI3WnKX99NwbgWLxJN7WyLv++PDE/oM3iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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