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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684bcae0fec08de1ff970238f43e00e49a1d14da90b399a5088e9ffe4f3cfc0d' 
  AND token = 'E14V1/QLt8n2X8P+XMP3bG9HlUBSuQQr7Pyoh2LE968=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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