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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9998c7372969956c7cfe6af95af60b292e2f617ed9d07c2f86a510a03f30963' 
  AND token = 'VjHLRDs1myT6LV6yZ0HUx4hz9NvYwBIV4IcWpJtcOhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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