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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fabf4d13e4f54aab22d89efab3c883d68a7ef4be87c9bbf4e07d5cd9f5e943' 
  AND token = 'oYesHDCzb2qWHT1TFxT9ai/3LnFM1toJFYKOnkNV9xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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