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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a62f225656a34c6bccf4e335feafe0225cc435938dd1c827bfaa42a9d0f9df' 
  AND token = 'JHcJHp9ev8fp3mBwJ/daVl7AGUqo71QYJsXIJ8AdZj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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