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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3568fbd11d757b921dfa9d22c4b7e77341d451c185c58775089bb8df667076a3' 
  AND token = 'IsAX8jYlLUcPc8CAeobiqIZqp45J98Wegr0sG1OqAzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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