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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b893b65a0a996800a256ef27efa3415a1c008f10e6ac8deb01ca5513cdcf8ff6' 
  AND token = 'hzmXHkZmV+NjcWkpA8//4PEpnXOEV6wPFRzQHp8moG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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