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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbd0410f09a864a6c2fc0ed672a128de94f73a8a3692c43ef585496dcbe12fb' 
  AND token = 'GBiL49BeXJdLSFaQu/7jFV9JOYcEeLwgqOzTaETEmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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