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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103e6e2b755905d91a32d01771d9f36bcb8e3d49e89170db43b6d85c7ee6010b' 
  AND token = 'E3GaPVkq8evdKZDWacRM1P9OqtIZAv7wSzU3ijHSof8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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