SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69d6c9122efa748734bd170de663bc41b9decf396d9bcc3b856ab686f09282a' 
  AND token = 'U7+YThstB/THiUKMHNWfHTA2KCReZd+1w5XK6yJG/v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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