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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360a6eb64a48645a9210ee93f47f0ec5d7c3cd09a22bb833708276a305c54ded' 
  AND token = 'wgXoNAdcC7j6pi6HpgwIpHQHttsIrRob4QEGYcdIF6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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