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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f78ed74f1dc9ab696b39f55b68bc5524c9063a6966a0f64a8ae2230e9bad3f6' 
  AND token = 'lNHrYKuBwdFI4vH33MiKp/RpCRjacajAkMxrCYhRd1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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