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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5b7e9696b52c46aaa1f3906ad613c83e3b032f60958aee86d37d612511a55c' 
  AND token = '7Brhx7jwj1jmHAqkhf6Z5MEmM11cU0Dg0DE+gOARNiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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