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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d86c147621c54b306064bf48f5709f81d9c66b66cd10bf63ffc5f303ab65066' 
  AND token = 'PwR8ZARbkg7iKCYocF9QMIURNkTRL9+0HGVne6Di6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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