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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89013b4dc0a9e94d04724ddf53ece328317d0a0471d1f72233ff0b21d609a86' 
  AND token = 'STf/8tT8Zk9QFEfkesSSnpzCq2VswinFvXFYpWpjafY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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