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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04364c417292fec9b635988b59b63ac2b2f9f4c696b545c0a2b4786d1e765f8d' 
  AND token = 'lNvhDT3lG7K6dml49Imz8s6V94mXwda6X2p8Q7qd/rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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