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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad9c11d935e3e6c8d593a91c299a9f2cfc369c0822fc1828b850a04bee11428' 
  AND token = 'ZE2frpLif6/Eiaq3PH/h56PHvj/kUR90R7IW8LDx8T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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