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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f1f7cce0ffa566e15959727165c389117ca0eeaa139ef83485dcd12ff56cac' 
  AND token = 'wx96/K0KlFIceU/UGA8NXCf8Ap6zIxTE3bUT9RfsL6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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