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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d406bd51b321d14e88f9cf2a83c9636c2ed3c40766d7673a5cc28674b15597' 
  AND token = 'TAgHt9cZHS/lNdyM0x8tPmJmt1ZXrSEBKDt/wv+QOrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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