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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8002ba86f08b34f55b088fd7f4732c74d07e5e44f22a5b608000fbbb546727d7' 
  AND token = '1ZKmiVc63j1fa2tAGL03LGi8qdkxOB8/ZtoWiBYu394=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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