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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbf3c708b9beca6eb8d6d20776d7c98032ff6d622fefefe94be4786eafa335c' 
  AND token = 'z7aQ8pD2Oqg/ZfgyXYS1X6mkcY8OnsMtZqiQWObY77Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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