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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e196cf779a638dfe035101a42e5c77ffca8fd140062d376d522e0a15333be3d5' 
  AND token = 'l9Y2yCscKwvBx/QpUdl8YhkQGHEv+QD2VXU2134LeNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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