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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a022983ff057ef15833664806f835946b88d41ce8486f9514b3df8d08e456be' 
  AND token = 'jxwEpsYirfeXA/QuQtL6UWQyTUxxmq6uMDp/DsveTO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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