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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8081e7a70e313fd13fa485595b7f95061a65d82374ff274d4738f01db84830c8' 
  AND token = 'q45J6i+he7sy/7gckyg82J5Nlg0FsxXYd8C5cn+7wxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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