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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8228c1120c0b337f5c6e7e196e05c784428f4b383ced906d0e9f8c7532943e7' 
  AND token = 'aX9RwgziZglfRnT1UYJC9s9R6rpruRlDeECcU5aEISE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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