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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47de92334f1cfb2c75d7122a79493ac6227be8c18b19cffa893b4d0ea362444f' 
  AND token = 'vcC3Q5O0SDb1tLZfIc8Kgpvk2o2BFMigBPT9TcinIaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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