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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f0e274d7ed486212f176d9ba374b922773dbff31a8f7ea14824eb592c9af6b' 
  AND token = 'rHMqdnrfwHXl460ZQbrYLNBeJ3ywqwBZ6Gpenc6Ocls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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