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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f354c9ace75799f4bb38cd923f66f36bbedf4f981961c15018f60d14209238a' 
  AND token = 'Xhq8DgjlbP/ojE6m+1P7f7+esG1n5m3wAVmU+yNl3S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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